Tirzepatide Dosage Calculator
Compounded tirzepatide is dispensed in multi-dose vials at concentrations commonly ranging from 5 mg/mL to 30 mg/mL. Because tirzepatide doses are significantly higher than semaglutide (2.5 mg to 15 mg weekly), higher concentrations keep injection volumes manageable. You will use a U-100 insulin syringe to draw your prescribed dose, so converting milligrams to syringe units correctly is essential for both safety and efficacy.
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Vial Concentration
How many units is 2.5 mg of Tirzepatide at 5 mg/mL?
Draw
50units
0.50 mL on a U-100 insulin syringe
2.5 mg ÷ 5 mg/mL × 100 = 50 units
For educational purposes only. Always follow your provider's instructions.
Quick Reference Table
All dose × concentration combinations
| Dose | 5 mg/mL | 10 mg/mL | 15 mg/mL | 25 mg/mL | 30 mg/mL | 60 mg/mL | 90 mg/mL | 100 mg/mL |
|---|---|---|---|---|---|---|---|---|
| 2.5 mg | 50 | 25 | 16.7 | 10 | 8.3 | 4.2 | 2.8 | 2.5 |
| 5 mg | 100* | 50 | 33.3 | 20 | 16.7 | 8.3 | 5.6 | 5 |
| 7.5 mg | 150* | 75* | 50 | 30 | 25 | 12.5 | 8.3 | 7.5 |
| 10 mg | 200* | 100* | 66.7* | 40 | 33.3 | 16.7 | 11.1 | 10 |
| 12.5 mg | 250* | 125* | 83.3* | 50 | 41.7 | 20.8 | 13.9 | 12.5 |
| 15 mg | 300* | 150* | 100* | 60* | 50 | 25 | 16.7 | 15 |
Values in U-100 insulin syringe units
* Exceeds 50 units (0.5 mL) — may require splitting into two injections
Brand Pen Schedules
Official titration schedules for pre-filled pens
Mounjaro
| Weeks | Dose | Phase |
|---|---|---|
| 1-4 | 2.5 mg | Initiation |
| 5-8 | 5 mg | Escalation |
| 9-12 | 7.5 mg | Escalation |
| 13-16 | 10 mg | Escalation |
| 17-20 | 12.5 mg | Escalation |
| 21+ | 15 mg | Maintenance |
Zepbound
| Weeks | Dose | Phase |
|---|---|---|
| 1-4 | 2.5 mg | Initiation |
| 5-8 | 5 mg | Escalation |
| 9-12 | 7.5 mg | Escalation |
| 13-16 | 10 mg | Escalation |
| 17-20 | 12.5 mg | Escalation |
| 21+ | 15 mg | Maintenance |
Frequently Asked Questions
How many units is 5 mg of tirzepatide?
It depends on your vial concentration. With a 10 mg/mL vial, 5 mg equals 50 units. With a 20 mg/mL vial, it equals 25 units. With a 30 mg/mL vial, it equals approximately 17 units. Always check your vial label and apply the formula: units = (dose in mg / concentration in mg per mL) x 100.
How do I convert tirzepatide units to milligrams?
Multiply the number of syringe units by the vial concentration in mg/mL, then divide by 100. For example, 25 units drawn from a 20 mg/mL vial delivers 5 mg of tirzepatide (25 x 20 / 100 = 5 mg). This reverse calculation lets you verify your drawn dose before injecting.
What concentrations does compounded tirzepatide come in?
Common compounded tirzepatide concentrations are 5 mg/mL, 10 mg/mL, 20 mg/mL, and 30 mg/mL. Higher concentrations are more common for tirzepatide than semaglutide because the prescribed milligram doses are larger. Your pharmacy label will state the exact concentration — always check it before drawing.
What is the tirzepatide dosage chart for a 10 mg/mL vial?
For a 10 mg/mL compounded vial: 2.5 mg = 25 units, 5 mg = 50 units, 7.5 mg = 75 units, and 10 mg = 100 units (a full 1 mL syringe). Doses above 10 mg at this concentration would exceed a standard 1 mL syringe, so higher-concentration vials (20 or 30 mg/mL) are typically used for doses of 12.5 mg and 15 mg.
How do I draw compounded tirzepatide from a vial?
Use a new, sterile U-100 insulin syringe. Clean the vial stopper with an alcohol swab. Draw air into the syringe equal to the needed volume, inject air into the vial, invert, and pull the plunger to the correct unit mark. Remove bubbles by tapping and gently pushing the plunger. Verify the unit count matches your prescribed dose before withdrawing the needle.
How many units is 10 mg of tirzepatide in a 20 mg/mL vial?
50 units. The calculation: 10 mg divided by 20 mg/mL equals 0.50 mL, and 0.50 mL on a U-100 syringe is 50 units. This is a common mid-range maintenance dose and keeps the injection volume to half a milliliter — comfortable for subcutaneous administration.
Is the dosing the same for Mounjaro and Zepbound?
Yes, both Mounjaro and Zepbound contain tirzepatide and use the same dose escalation schedule from 2.5 mg to 15 mg weekly. Mounjaro is approved for type 2 diabetes and Zepbound for weight management, but the active ingredient, dose strengths, and pen design are identical. Compounded tirzepatide follows the same escalation under provider guidance.
Why do tirzepatide vials come in higher concentrations than semaglutide?
Tirzepatide maintenance doses (up to 15 mg) are much larger than semaglutide maintenance doses (up to 2.4 mg). Without higher concentrations, the injection volume would be uncomfortably large. A 15 mg dose at 30 mg/mL is just 50 units (0.5 mL), whereas at 5 mg/mL it would be 300 units (3 mL) — far too much for a standard insulin syringe.
How many doses can I get from one tirzepatide vial?
It depends on vial volume, concentration, and your weekly dose. A 5 mL vial at 10 mg/mL contains 50 mg total. At 2.5 mg weekly, that is 20 doses. At 5 mg weekly, 10 doses. At 10 mg weekly, 5 doses. Check your vial label for total volume and concentration, then divide total mg by your weekly dose to calculate how many weeks the vial will last.
Can I use a tirzepatide injection units calculator for any vial concentration?
Yes. Our calculator accepts any concentration in mg/mL and any prescribed dose in mg. Whether your compounding pharmacy provides 5, 10, 20, 30, or any custom concentration, the calculator applies the standard formula (dose / concentration x 100) to give you the correct U-100 syringe unit count.